/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Id: BMPattern.hpp 176026 2004-09-08 13:57:07Z peiyongz $
 */

#if !defined(BMPATTERN_HPP)
#define BMPATTERN_HPP
// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/util/XMemory.hpp>
#include <xercesc/util/PlatformUtils.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class XMLUTIL_EXPORT BMPattern : public XMemory
{
public:
	// -----------------------------------------------------------------------
	//  Public Constructors and Destructor
    // -----------------------------------------------------------------------
	/** @name Constructors */
    //@{

	/**
      * This is the onstructor which takes the pattern information. A default
      * shift table size is used.
      *
      * @param  pattern     The pattern to match against.
      *
      * @param  ignoreCase  A flag to indicate whether to ignore case
	  *						matching or not.
      *
      * @param  manager     The configurable memory manager
      */
	BMPattern
    (
        const XMLCh* const pattern
        , bool ignoreCase
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );

	/**
      * This is the constructor which takes all of the information
      * required to construct a BM pattern object.
      *
      * @param  pattern     The pattern to match against.
      *
	  * @param	tableSize	Indicates the size of the shift table.
	  *
      * @param  ignoreCase  A flag to indicate whether to ignore case
	  *						matching or not.
      *
      * @param  manager     The configurable memory manager
      */
	BMPattern
    (
        const XMLCh* const pattern
        , int tableSize
        , bool ignoreCase
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );

	//@}

	/** @name Destructor. */
    //@{

	/**
	  * Destructor of BMPattern
	  */
	~BMPattern();

	//@}

	// -----------------------------------------------------------------------
	// Matching functions
	// -----------------------------------------------------------------------
	/** @name Matching Functions */
	//@{

	/**
	  *	This method will perform a match of the given content against a
	  *	predefined pattern.
	  */
	int matches(const XMLCh* const content, int start, int limit);

	//@}

private :
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    BMPattern();
    BMPattern(const BMPattern&);
    BMPattern& operator=(const BMPattern&);

		// -----------------------------------------------------------------------
	// This method will perform a case insensitive match
	// -----------------------------------------------------------------------
	bool matchesIgnoreCase(const XMLCh ch1, const XMLCh ch2);

	// -----------------------------------------------------------------------
	// Initialize/Clean up methods
	// -----------------------------------------------------------------------
	void initialize();
	void cleanUp();

	// -----------------------------------------------------------------------
    //  Private data members
    //
    //  fPattern
	//	fUppercasePattern
    //      This is the pattern to match against, and its upper case form.
	//		
    //  fIgnoreCase
    //      This is an indicator whether cases should be ignored during
	//		matching.
    //
    //  fShiftTable
	//	fShiftTableLen
    //      This is a table of offsets for shifting purposes used by the BM
	//		search algorithm, and its length.
    // -----------------------------------------------------------------------
	bool           fIgnoreCase;
	unsigned int   fShiftTableLen;
	int*           fShiftTable;
	XMLCh*         fPattern;
	XMLCh*         fUppercasePattern;
    MemoryManager* fMemoryManager; 
};

XERCES_CPP_NAMESPACE_END

#endif

/*
 * End of file BMPattern.hpp
 */

